Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ea38eb857c10c4…

MALICIOUS

PDF

90.2 KB Created: 2021-06-26 21:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4a346d42496024f71e1917258b320360 SHA-1: dad60330917e56434a9d086bcee0b717afdec86c SHA-256: 52ea38eb857c10c4f685664b37f431ef6262c5c3ff4dd5ee6be5995bed57fe96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=diary+of+a+wimpy+kid+hard+luck+pdf PDF link annotation
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/a55f1f3ad9341db832602081d491bead/vukijajizadidujopataza.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098af065d8cd---28791945792.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/mabexowupugozegopipotigo.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/leriv.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf801a48bb---91165442574.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/99326428501.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3047ae62da9d2bb77e9d67d4cb5153ca/lumafinoxevadefo.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/8bf9a81ecf6f590b42eb48ab93b49f87/5212113579.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/51990876559.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///96749311016.pdfIn PDF document text
    • http://sooclose.eu/upload/File/tebepekimib.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/12559387801.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17ccc89cf0---689625423.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c62de7aed9951ac2c8b238a5219cb85f/kewef.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/ba8bd213db23552e7cf1a4a5db75ebe0/92702968575.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f18691492---42800300602.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/19374381415.pdfIn PDF document text
    • http://kids-ex.com/49107529873.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/pawoxodarumifavunolapo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca4767a23---rupunowegede.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/15401389402e5f4bca45bc58fe36e54c/nedaxe.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3cec04df0e69b5c303f3ca4629c110db/kitibasazetemuxadevuwuri.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 16676 bytes
SHA-256: b547ec6554456de3828f95c4b7b2873034efcd8ad17e4960a31d074784385e85
font_01_sfnt_off000113bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 10776 bytes
SHA-256: 10faf432a57fdb279f8b6f533762d0781d7e36df09f44d5f50bfcffdff4265cc
font_02_sfnt_off00012c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8E 16472 bytes
SHA-256: 3eeca2e0cba229df837d555c5c119f1c64f28089b2a92bc0f990d9d6c20948d1
font_03_sfnt_off0001431e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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